Fix Inconsistent results with HLA- prefix

Author: pbashyal-nmdp

pyard/pyard.py

@@ -392,11 +392,14 @@ def redux(self, allele: str, ars_type: str) -> str:
         :rtype: str
         """
 
-        # PERFORMANCE: precompiled regex
-        # dealing with leading 'HLA-'
+        # deal with leading 'HLA-'
         if self.HLA_regex.search(allele):
             hla, allele_name = allele.split("-")
-            return "-".join(["HLA", self.redux(allele_name, ars_type)])
+            redux_allele = self.redux(allele_name, ars_type)
+            if redux_allele:
+                return "HLA-" + redux_allele
+            else:
+                return redux_allele
 
         # Alleles ending with P or G are valid
         if allele.endswith(('P', 'G')):

tests/test_pyard.py

@@ -76,3 +76,5 @@ def test_redux_gl(self):
 
     def test_mac_G(self):
         self.assertEqual(self.ard.redux("A*01:01:01", 'G'), "A*01:01:01G")
+        self.assertEqual(self.ard.redux_gl("HLA-A*01:AB", "G"), "HLA-A*01:01:01G/HLA-A*01:02")
+        self.assertEqual(self.ard.redux("HLA-A*01:AB", "G"), "")